$$\{(\frac{1}{4})^{-3}-(\frac{1}{4})^{-3}\div(\frac{1}{5})^{-3}\}$$
$\frac{7936}{125}=63.488$
$$64-\frac{\left(\frac{1}{4}\right)^{-3}}{\left(\frac{1}{5}\right)^{-3}}$$
$$64-\frac{64}{\left(\frac{1}{5}\right)^{-3}}$$
$$64-\frac{64}{125}$$
$$\frac{7936}{125}$$
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$\frac{2 ^ {8} \cdot 31}{5 ^ {3}} = 63\frac{61}{125} = 63.488$
